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If frogs were to go from living in a tropical rainforest to living in a grassland/savanna, they would grow fur. Frogs living in tropical rainforests have slimy but rough exposed skin that tends to help them blend in with their surroundings. In a hundred thousand years, with global warming and climate change, a tropical rainforest could become a grassland. The results of this could cause many animals living in a tropical rainforest to adapt to a new environment and make exterior or interior changes. If this were to happen to a frog, then it might grow grass colored fur because it is living in a drier area with greater predators, which gives it the need to protect itself.